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粘結指數測定步驟

发布时间：2010-04-27 点击次数：1753次

先稱取5g無煙煤，再稱取1g試驗煤樣，放入坩埚。稱量應稱准到0.001g。用攪拌絲將坩埚內的混合樣攪拌2min.攪拌方法是：坩埚做45°左右傾斜，逆時針方向轉動，約15r/min.攪拌絲按同樣傾角做順時針方向轉動，約150r/min，攪拌時，攪拌絲的圓環接觸坩埚壁與底相連接的圓弧部分。經1min45s後，一邊繼續攪拌，一邊將坩埚和坩埚絲逐漸轉到垂直位置，經2min後，攪拌結束。攪拌後，將坩埚壁上煤粉輕輕掃下，用攪拌絲仔細將混合煤樣撥平，比坩埚壁的層面略低1~2mm,以便壓塊將混合物壓緊後，使煤樣表面處于同一平面。

用鑷子加壓塊于坩埚中央，然後將其置于壓力器下壓30s，加壓時防止沖擊。加壓結束後，壓塊仍留在混合煤樣上，加上坩埚蓋。注意從攪拌開始，帶有混合煤樣的坩埚，應輕拿輕放，避免受到撞擊與振動。

將帶蓋德坩埚放在坩埚架中，用帶手柄的平鏟托起坩埚架，放入預先升溫到850℃的馬弗爐內的恒溫區。放入坩埚後的6min內，爐溫應恢複到850℃，以後爐溫應保持在（850 10）℃

從放入坩埚開始計時，焦化15min之後，將坩埚從馬弗爐中取出，放置冷卻到室溫。若不立即進行轉鼓實驗，則將坩埚放入幹燥箱內。馬弗爐溫度測溫點，應在兩行坩埚中央。

從冷卻後的坩埚中取出壓塊。當壓塊上附有焦屑時，應刷入坩埚內。稱量焦渣總量，然後將其放入轉鼓內，進行第一次轉鼓試驗，轉鼓試驗後的焦塊用1mm圓孔篩進行篩分，再稱量篩上部分的質量，然後，將其放入轉鼓進行第二次轉鼓試驗，重新篩分、稱量操作。每次轉鼓試驗5r，即250g。稱量准確到0.01g。

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